900000000
domain: N
Appears in sequences
- Powers of 3 written in base 27.at n=26A004669
- Squares using no more than two distinct digits.at n=35A018885
- Number of nonzero palindromes of length n.at n=16A050683
- Number of nonzero palindromes of length n.at n=17A050683
- First differences of 10^n (A011557).at n=8A052268
- a(n) = (n-1)*n^(n-2).at n=9A053506
- a(n) = n*10^(n-1).at n=8A053541
- Essentially A053506 but with leading 0 (instead of 1) and offset 0.at n=9A055861
- Squares such that (1) each digit is a square, (2) the sum of squares of the digits is a square.at n=19A061272
- a(n) is the number of n-digit multiples of n.at n=9A061772
- Number of nonnegative integers with n digits.at n=8A063945
- Smallest n-digit square starting with 9, or 0 if no such number exists.at n=8A067479
- Number of n-digit palindromes.at n=16A070252
- Number of n-digit palindromes.at n=17A070252
- Largest n-digit square which leaves a square at every step if most significant digit and least significant digit are deleted until a one- or two-digit square is obtained. a(2n) = 0 if no such square exists. a(2n+1) = 9*10^2n only if no nontrivial candidate exists.at n=8A077486
- Smallest n-digit square beginning with n.at n=8A077503
- Largest n-digit multiple of n with digit sum n.at n=8A077758
- Squares in which the neighboring digits differ at most by 1. Neighbors of 1 are 0 and 2, neighbors of 0 are 1 and 9.at n=22A087553
- Numbers k such that the k-th triangular number contains only digits {0,4,5}.at n=24A119072
- a(n) = A138793(n+1)-A138793(n).at n=7A138794